package com.bl.utils;

import org.apache.commons.lang.StringUtils;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpDelete;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpPut;
import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.conn.scheme.Scheme;
import org.apache.http.conn.scheme.SchemeRegistry;
import org.apache.http.conn.ssl.SSLSocketFactory;
import org.apache.http.entity.ByteArrayEntity;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;

import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

public class HttpUtils {

     /**
      * get
      *
      * @param host
      * @param path
      * @param method
      * @param headers
      * @param querys
      * @return
      * @throws Exception
      */
     public static HttpResponse doGet(String host, String path, String method,
                                      Map<String, String> headers,
                                      Map<String, String> querys)
             throws Exception {
          HttpClient httpClient = wrapClient(host);

          HttpGet request = new HttpGet(buildUrl(host, path, querys));
          for (Map.Entry<String, String> e : headers.entrySet()) {
               request.addHeader(e.getKey(), e.getValue());
          }

          return httpClient.execute(request);
     }

     /**
      * post form
      *
      * @param host
      * @param path
      * @param method
      * @param headers
      * @param querys
      * @param bodys
      * @return
      * @throws Exception
      */
     public static HttpResponse doPost(String host, String path, String method,
                                       Map<String, String> headers,
                                       Map<String, String> querys,
                                       Map<String, String> bodys)
             throws Exception {
          HttpClient httpClient = wrapClient(host);

          HttpPost request = new HttpPost(buildUrl(host, path, querys));
          for (Map.Entry<String, String> e : headers.entrySet()) {
               request.addHeader(e.getKey(), e.getValue());
          }

          if (bodys != null) {
               List<NameValuePair> nameValuePairList = new ArrayList<NameValuePair>();

               for (String key : bodys.keySet()) {
                    nameValuePairList.add(new BasicNameValuePair(key, bodys.get(key)));
               }
               UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(nameValuePairList, "utf-8");
               formEntity.setContentType("application/x-www-form-urlencoded; charset=UTF-8");
               request.setEntity(formEntity);
          }

          return httpClient.execute(request);
     }

     /**
      * Post String
      *
      * @param host
      * @param path
      * @param method
      * @param headers
      * @param querys
      * @param body
      * @return
      * @throws Exception
      */
     public static HttpResponse doPost(String host, String path, String method,
                                       Map<String, String> headers,
                                       Map<String, String> querys,
                                       String body)
             throws Exception {
          HttpClient httpClient = wrapClient(host);

          HttpPost request = new HttpPost(buildUrl(host, path, querys));
          for (Map.Entry<String, String> e : headers.entrySet()) {
               request.addHeader(e.getKey(), e.getValue());
          }

          if (StringUtils.isNotBlank(body)) {
               request.setEntity(new StringEntity(body, "utf-8"));
          }

          return httpClient.execute(request);
     }

     /**
      * Post stream
      *
      * @param host
      * @param path
      * @param method
      * @param headers
      * @param querys
      * @param body
      * @return
      * @throws Exception
      */
     public static HttpResponse doPost(String host, String path, String method,
                                       Map<String, String> headers,
                                       Map<String, String> querys,
                                       byte[] body)
             throws Exception {
          HttpClient httpClient = wrapClient(host);

          HttpPost request = new HttpPost(buildUrl(host, path, querys));
          for (Map.Entry<String, String> e : headers.entrySet()) {
               request.addHeader(e.getKey(), e.getValue());
          }

          if (body != null) {
               request.setEntity(new ByteArrayEntity(body));
          }

          return httpClient.execute(request);
     }

     /**
      * Put String
      *
      * @param host
      * @param path
      * @param method
      * @param headers
      * @param querys
      * @param body
      * @return
      * @throws Exception
      */
     public static HttpResponse doPut(String host, String path, String method,
                                      Map<String, String> headers,
                                      Map<String, String> querys,
                                      String body)
             throws Exception {
          HttpClient httpClient = wrapClient(host);

          HttpPut request = new HttpPut(buildUrl(host, path, querys));
          for (Map.Entry<String, String> e : headers.entrySet()) {
               request.addHeader(e.getKey(), e.getValue());
          }

          if (StringUtils.isNotBlank(body)) {
               request.setEntity(new StringEntity(body, "utf-8"));
          }

          return httpClient.execute(request);
     }

     /**
      * Put stream
      *
      * @param host
      * @param path
      * @param method
      * @param headers
      * @param querys
      * @param body
      * @return
      * @throws Exception
      */
     public static HttpResponse doPut(String host, String path, String method,
                                      Map<String, String> headers,
                                      Map<String, String> querys,
                                      byte[] body)
             throws Exception {
          HttpClient httpClient = wrapClient(host);

          HttpPut request = new HttpPut(buildUrl(host, path, querys));
          for (Map.Entry<String, String> e : headers.entrySet()) {
               request.addHeader(e.getKey(), e.getValue());
          }

          if (body != null) {
               request.setEntity(new ByteArrayEntity(body));
          }

          return httpClient.execute(request);
     }

     /**
      * Delete
      *
      * @param host
      * @param path
      * @param method
      * @param headers
      * @param querys
      * @return
      * @throws Exception
      */
     public static HttpResponse doDelete(String host, String path, String method,
                                         Map<String, String> headers,
                                         Map<String, String> querys)
             throws Exception {
          HttpClient httpClient = wrapClient(host);

          HttpDelete request = new HttpDelete(buildUrl(host, path, querys));
          for (Map.Entry<String, String> e : headers.entrySet()) {
               request.addHeader(e.getKey(), e.getValue());
          }

          return httpClient.execute(request);
     }

     private static String buildUrl(String host, String path, Map<String, String> querys) throws UnsupportedEncodingException {
          StringBuilder sbUrl = new StringBuilder();
          sbUrl.append(host);
          if (!StringUtils.isBlank(path)) {
               sbUrl.append(path);
          }
          if (null != querys) {
               StringBuilder sbQuery = new StringBuilder();
               for (Map.Entry<String, String> query : querys.entrySet()) {
                    if (0 < sbQuery.length()) {
                         sbQuery.append("&");
                    }
                    if (StringUtils.isBlank(query.getKey()) && !StringUtils.isBlank(query.getValue())) {
                         sbQuery.append(query.getValue());
                    }
                    if (!StringUtils.isBlank(query.getKey())) {
                         sbQuery.append(query.getKey());
                         if (!StringUtils.isBlank(query.getValue())) {
                              sbQuery.append("=");
                              sbQuery.append(URLEncoder.encode(query.getValue(), "utf-8"));
                         }
                    }
               }
               if (0 < sbQuery.length()) {
                    sbUrl.append("?").append(sbQuery);
               }
          }

          return sbUrl.toString();
     }

     private static HttpClient wrapClient(String host) {
          HttpClient httpClient = new DefaultHttpClient();
          if (host.startsWith("https://")) {
               sslClient(httpClient);
          }

          return httpClient;
     }

     private static void sslClient(HttpClient httpClient) {
          try {
               SSLContext ctx = SSLContext.getInstance("TLS");
               X509TrustManager tm = new X509TrustManager() {
                    @Override
                    public X509Certificate[] getAcceptedIssuers() {
                         return null;
                    }

                    @Override
                    public void checkClientTrusted(X509Certificate[] xcs, String str) {

                    }

                    @Override
                    public void checkServerTrusted(X509Certificate[] xcs, String str) {

                    }
               };
               ctx.init(null, new TrustManager[]{tm}, null);
               SSLSocketFactory ssf = new SSLSocketFactory(ctx);
               ssf.setHostnameVerifier(SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
               ClientConnectionManager ccm = httpClient.getConnectionManager();
               SchemeRegistry registry = ccm.getSchemeRegistry();
               registry.register(new Scheme("https", 443, ssf));
          } catch (KeyManagementException ex) {
               throw new RuntimeException(ex);
          } catch (NoSuchAlgorithmException ex) {
               throw new RuntimeException(ex);
          }
     }
}